dPMR (digital Private Mobile Radio) is an open ETSI standard published under the references TS 102 490 (License-free) and TS 102 658 (Licensed). It uses FDMA technology with a channel spacing of 6.25 kHz and supports voice and data applications. The modulation scheme is 4FSK with a bit rate of 4800 bps.
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Parameter |
Value |
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Frequency range |
Unlicensed: ETSI TS 102 490 446.100 - 446.200 MHz (CEPT ECC/DEC/(05)12) 149.01875 - 149.11875 MHz Licensed: ETSI TS 102 658 Licensed PMR frequency bands |
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Operation modes |
FDMA, digital voice and data system |
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Modulation |
4FSK (constant envelope FSK) |
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Symbol rate |
2400 Bd |
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Receiver settings |
BW |
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Input format(s) |
IF |
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Additional Info |
Voice codec: AMBE+2 (3600 bps) Bit rate: 4800 bps Supported Modes Ø dPMR446 Ø dPMR Mode 1 Ø dPMR Mode 2 |
TS 102 490 covers only license-free hand portable equipment operating in peer-to-peer mode. The radios should have an integral antenna and are limited in their output power. The standard is also called as dPMR446.
TS 102 658 uses the same air interface technology as in dPMR446 without the limitations of the license-free counterpart. It supports different levels of functionality as listed below.
Ø Mode 1: Peer-to-peer direct network
Ø Mode 2: Conventional repeater network
Ø Mode 3: Managed centralized network
The current version of the dPMR decoder supports the Modes 1 and 2 as well as the license-free dPMR446 operation.
To use the mode set Offset to the IF output of the receiver. Decoded voice will be saved in a “.wav” file in the default Data-Output directory. Use the Mute button to mute or un-mute live voice output to the speaker. In the menu “Option -> Message Type” user can set decoder output to “Data & Voice Frames” or “Bit Transparent”. With “Bit Transparent” option the frames are just output in bits and no protocol decoding is made. This may be useful when the frames are coded in another way than according to the ETSI standard.
